Fluoropolymer composite with high ionic conductivity

Abstract

A fluoropolymer composite with high ionic conductivity that may be applied in electroactive polymer composite includes following components: PVDF-g-SPS; PVDF; and hydrocarbon- or fluoro-elastomer. After being mixed with specific proportion and being dissolved in an oily or non-oily solvent of non-proton or proton of high boiling point, the invention is coated on a substrate and is heated to get rid of the solvent afterwards to get a compound membrane. Then, a compound membrane of PVDF-g-SPS may be obtained by sulphonating the aforementioned compound membrane. The obtained compound membrane has excellent properties, such as thermal stability, acid-alkali resistance, good mechanical performance, excellent flexibility, and capability for processing appropriate cross-link for further enhancing the mechanical performance of this membrane.

What is claimed is:  
     
         1 . A fluoropolymer composite with high ionic conductivity, applicable in the electroactive polymer composite, comprised by following components: 
 PVDF-g-SPS;    PVDF; and    Hydrocarbon-elastomer.    
     
     
         2 . The fluoropolymer composite with high ionic conductivity according to  claim 1 , wherein the manufacturing method for the PVDF-g-SPS is that the polystyrene is grafted onto the main chain of the macromolecular of the polyvinylidene fluoride resin that is then ionized by sulfonyl group to become ionomer.  
     
     
         3 . The fluoropolymer composite with high ionic conductivity according to  claim 1 , wherein the fluoropolymer composite with high ionic conductivity may be cross-linked by any one of the two cross-linkers, that is, the compounds belonged to diamine or peroxide, and the amount of the cross-linker is around 0.5˜5% of the entire weight of the composite, and the temperature of the cross-link is between 25° C. to 200° C., and the pressure range is 0˜500 psi.  
     
     
         4 . The fluoropolymer composite with high ionic conductivity according to  claim 1 , wherein the molecular weight of the PVDF is between 80,000 and 350,000.  
     
     
         5 . The fluoropolymer composite with high ionic conductivity according to  claim 2 , wherein the grafting rate for the styrene monomer onto the PVDF is between 10% to 100 mole %.  
     
     
         6 . The fluoropolymer composite with high ionic conductivity according to  claim 1 , wherein the hydrocarbon-elastomer may be poly ethyl acrylate, and its molecular weight is between 100,000 to 300,000.  
     
     
         7 . The fluoropolymer composite with high ionic conductivity according to  claim 2 , wherein the sulphonating rate of the PVDF-g-SPS is between 30% and 100%.  
     
     
         8 . The fluoropolymer composite with high ionic conductivity according to  claim 7 , wherein the sulphonating rate of the PVDF-g-SPS is between 60% and 100%.  
     
     
         9 . The fluoropolymer composite with high ionic conductivity according to  claim 1 , wherein the weight proportion of the PVDF-g-SPS is between 10% to 60%, the weight proportion of the PVDF is between 15% to 50%, and the weight proportion of the hydrocarbon-elastomer is between 10% to 60%.  
     
     
         10 . The fluoropolymer composite with high ionic conductivity according to  claim 1 , wherein the hydrocarbon-elastomer may be acrylic-elastomer, such as: poly ethyl acrylate or the derivatives of other alkyl, and the adding amount proportion is between 10% and 60% of the weight of total composite.  
     
     
         11 . A fluoropolymer composite with high ionic conductivity, which is applicable in the electroactive polymer composite and is comprised by following three components: 
 PVDF-g-SPS;    PVDF; and    Fluoro-elastomer.    
     
     
         12 . The fluoropolymer composite with high ionic conductivity according to  claim 1   1 , wherein the manufacturing method for the PVDF-g-SPS is that the polystyrene is grafted onto the main chain of the macromolecular of the polyvinylidene fluoride resin that is then ionized by sulfonyl group to become ionomer.  
     
     
         13 . The fluoropolymer composite with high ionic conductivity according to  claim 11 , wherein the fluoropolymer composite with high ionic conductivity may be cross-linked by any one of the two cross-linkers, that is, the compounds belonged to diamine or peroxide, and the amount of the cross-linker is around 0.5˜5% of the entire weight of the composite, and the temperature of the cross-link is between 25° C. to 200° C., and the pressure range is 0˜500 psi.  
     
     
         14 . The fluoropolymer composite with high ionic conductivity according to  claim 11 , wherein the molecular weight of the PVDF is between 80,000 and 350,000.  
     
     
         15 . The fluoropolymer composite with high ionic conductivity according to  claim 12 , wherein the grafting rate for the styrene monomer onto the PVDF is between 10% and 100 mole %.  
     
     
         16 . The fluoropolymer composite with high ionic conductivity according to  claim 12 , wherein the sulphonating rate of the PVDF-g-SPS is between 30% and 100%.  
     
     
         17 . The fluoropolymer composite with high ionic conductivity according to  claim 16 , wherein the sulphonating rate of the PVDF-g-SPS is between 60% and 100%.  
     
     
         18 . The fluoropolymer composite with high ionic conductivity according to  claim 11 , wherein the weight proportion of the PVDF-g-SPS is between 10% to 60%, the weight proportion of the PVDF is between 15% to 50%, and the weight proportion of the hydrocarbon-elastomer is between 10% to 60%.  
     
     
         19 . The fluoropolymer composite with high ionic conductivity according to  claim 11 , wherein the molecular weight of the fluoro-elastomer is between 80,000 and 2,800,000.  
     
     
         20 . The fluoropolymer composite with high ionic conductivity according to  claim 11 , wherein the fluoro-elastomer may be Viton or polymer of vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene, and the proportion of its adding weight is between 10% and 60% of the weight of total composite.